Puller switch



April 15, 1958 H. H. KOBRYNER ,8

FULLER SWITCH Filed Feb. 5, 1957 2 Sheets-Sheet l I IN V EN TOR. F1814 l/[AMAN/f/(OBEYNEB QM 714 Ga" ATTORNEY April 1958 H. H. KOBRYNER 2,831,088

FULLER SWITCH Filed Feb. 5, 1957 2 Sheets-Sheet 2 VIII; 4

Fig. 6

INVENTOR. HERMAN H KOBE YNEE ATIWRNEY nited States Patent 2,831,088 Patented Apr. 15, 1958 flice PULLER SWITCH Herman H. Kobryner, Forest Hills, N. Y., assignor to Murray Manufacturing Corporation, Brooklyn, N. Y.

Application February 5, 1957, Serial No. 638,260 6 Claims. (Cl. 200-133) This invention relates to a puller-type switch, and more particularly to such a switch capable of being easily converted from one current carrying capacity to another, different current carrying capacity.

The puller type switch to which this invention relates comprises essentially a base assembly and a puller assembly. The base assembly comprises two pairs of switch jaws connected to line and load conductors respectively The puller, or fuse carrier, assembly also comprises two pairs of switch blades, electrically bridged by a fuse, and adapted to engage the switch jaws. Thus, when the puller is connected to the base, i. e., when the switch blades are inserted into the respective switch jaws, a circuit is completed from the line to the load conductors. Switches of this type are generally, of the double pole type.

Puller type switches rated at30 and 60 amperes are in large demand today because they possess certain advantages which are peculiar to their unique construction. A few of the advantages are the relatively small size, the comparatively low, price, the complete safety in replacing fuses. because the fusecarrier ,(puller) is completely removed from the line and load wiring whilereplacing' the fuse, and the relative ease with which all hazardous parts can be shielded and thus provide the user with complete protection.

In recent years there has been an increasing demand in the home for electrical equipment and appliances, requiring more current andtherefore switches of greater current carrying capacity. Thus, a demand has arisen for puller type switches rated at 100 and 200 amperes. Although the demand for the larger switches is increasing,'it-is still small relative to the demand for the 30 and 60 ampere rated switches and therefore could not justify the investment required to make new'tools and molds for each of the 100 and 200 ampere switches.

Accordingly, it is an object of this invention to provide 100 and 200 ampere puller type switches which usetthe same molded parts; or to state it more broadly, to'p'rovide two puller type switches of different current carrying capacities which use the same molded parts.

It is a feature of my invention to provide a novel molded base for the switch designed to accommodate either two 100 ampere fuses or one 200 amperefuse with equal facility. A p

The above and further objects1of this invention will become more apparent when'taken in conjunction with the following detailed description and drawing, wherein:

Fig. l lSvfl top, viewof the molded base assembly; Fig. 2 is a side view taken along lines 2,'2 of Fig. 1; Fig. 3 is a bottom view of the molded base assembly; Fig. 4 is a top viewofjtwopuller assembliesfconnected together; I I

Fig. 5 is a side view'of the puller assemblies taken along lines'S-ES ofFig.,4;. nd .7 H I gfig. 6 is a bottom view of the puller assemblies. 5 Referring first to liigs. 1, 2and,3,, there are shown three views of my novel base assembly, for the puller switch, which is capable of accommodating a puller assembly carrying either two 100 ampere fuses or one 200 ampere fuse. The base assembly comprises a molded box 1, made of a suitable insulating material, having a bottom 2, side walls 3, 4 and end walls 5, 6. At the opposite end walls 5, 6 of the molded box and extending from the bottom thereof 2, platforms 7 and 55 are provided for supporting either two or four terminal posts, depending on whether the switch is employed as a single pole or double pole unit.

If the switch is utilized to service a 200 ampere load then only two terminal posts are required 9, .10 (single pole connection); one of which is connected to the line wiring and the other to the load wiring. For double pole 200 ampere service, two base assemblies are required mounted side by side.

If the switch is utilized to service a double pole 100 ampere load then two additional terminal posts are required at positions 11, 12 opposite posts 9 and 10 respectively.

The base assembly further comprises four switch jaws, each comprising a clip portion 13 (Fig. 2) located in the interior of the box and an extension 14 passing through an opening in the end wall and secured to the platform by means of a bolt 15 and nut 16. The terminal posts, where used, are mounted on the extension 14 of the switch aws.

The end walls 5, 6 are molded to include a bay or projected portion 17 so that the distance between opposite bay portions is increased relative to the distance between the remaining portions of the end walls. As best seen in Fig. 2, the height of the bay portions is greater than the height of the adjacent end and side walls by approximately the thickness of such walls. The purpose of the bay portions and its raised height will become clear from the description of the puller assembly.

Extending from the respective bay portions 17 of the end walls and at right-angles to the platforms are ribs 18, 19, 20 and 21 which serve to strengthen the box and separate the wiring connected to adjacent terminal posts when the unit is wired for double-pole operation. A recessed hole 22, 23 is provided between the respective pairs of ribs 18, 19 and 20, 21 for screws or the like in mounting the base assembly.

The bottom 2 of the box is molded with a recessed or well portion 24 for reasons which will also become clear from the description of the puller assembly.

When the base assembly is fitted for single pole 200 ampere operation jumpers 25 and 26 (Figs. 2, 3) are provided to connect electrically the adjacent switch jaws together. Such jumpers, of course, are not used for ampere, double pole operation. Each of the jumpers 25, 26 comprises a bridge portion 27 which follows generally the contour across the bottom of the box and a pair of arms28, 2& extending respectively from opposite ends of the bridge portion 27 to the platform. The arms are positioned to contact the underside of the switch jaws and are secured to the platform by the bolts and nuts 15, 16.

As best seen in Fig. 2, the lowermost edges of the platform extend below the bottom surface of the jumpers in order that the electrical connections may be separated from the mounting surface.

Referring now to Figs. 4, 5 and 6, there is illustrated a 2 pole, 200 ampere puller assembly formed by mounting side by side two single pole, 200 ampere puller assemblies.

Where it is desired to use the puller switch for 2 pole, 100 ampere service only one base and puller assembly is required. However, it will be recalled, that where it is desired to use the base assembly for 200 ampere service,

the switch jaws at either ends are connected together by jumpers, thereby converting the base assembly to a single pole, 200 ampere unit. Thus, for 2 pole, 200 ampere 0 service, two such base assemblies and two puller assemblies are mounted side by side.

Referring first to Fig. 4, there is shown a top view of molded covers 313, 31, mounted side by side and secured in position by a handle plate 32, screwed to the covers as shown. A pair of C-shaped handles 33, 34 are pivotally mounted on the respective covers by fitting the ends of the C 35 (Fig. 5) loosely between a slot 36 provided in the cover and the handle plate 32.

The opposite ends of the covers 30, 31 are also molded with bay or projected portions 37, 38. length of each cover are substantially equal to the width and length of the associated box so that the covers rest on the upper edges of the side and end walls 3, 4, 5 and 6 of the boxes. However, the distance between the opposite bay portions 37, 38 is such that the bay portions of each cover fit snugly within the raised bay portions of the box. The correspondence between the bay portions of the cover and box restrain the cover from any movement other than the desired rearward and forward movements required in opening and covering the box of the base assembly.

Each of the covers of the puller assembly carries four switch blades 39, 49, and 42, Figs. 5 and 6, which are positioned to slide into the switch jaws located in each Each cover of the puller assembly carries either one or two fuses depending on the capacity of the fuse. For 100 ampere service two fuses are carried by the cover, one connected between each pair of opposite switch blades by means of fuse clips. However, because the 200 ampere fuse is considerably longer and wider than the 100 ampere fuse it is possible to accommodate only one. Thus, referring to Figs. 5 and 6 a 200 ampere fuse (not shown) is carried by each cover by means of fuse clips 46, 47, positioned intermediate the adjacent switch blades and bolted to the jumpers by bolt 48 and nut 49. The fuse clips are so positioned that when the fuse is inserted therein and the cover fully seated on the box, the fuse lies partly in the recessed portion of the box. Each of the fuse clips comprises a flat base 50 which bears against the jumper, and arms 51, 52 which extend towards each other sufficiently to prevent the rectangular nut from rotating as the bolt 43 is turned. The arms 51, 52 then extend away from the base sufficiently to carry the fuse in the space alloted in the box. The ends 53, 54 of the arms are bent outwardly for a short distance to facilitate entry 1 and a puller assembly; said base assembly comprising a molded hollow rectangular box being open at the top and having side walls, end walls and bottom, said bottom being provided with a recessed portion located intermediate the side walls and extending toward said end walls, said end walls shaped to include a bay portion intermediate the side edges thereof and extending from top to bottom, the distance between said bay portions and the increased space provided by said recessed portion being sufiicient to accornmodate a cartridge-type fuse of relatively large size The width and till and the lesser distance between the remaining portions of the end walls being sufiicient to accommodate alternatively a pair of fuses of smaller size, a pair of switch jaws mounted on the bottom of the box at each of the end walls thereof, means for connecting a line conductor to a switch jaw of one of said pairs, and means for connecting a load conductor to a switch jaw of the other of said pairs; said puller assembly comprising a molded cover for covering the top of said box, the ends of said cover ineluding bay portions similar in shape to, and dimensioned to fit snugly between, the bay portions in said box, means connecting two pairs of switch blades to the underside of said cover positioned to engage said switch jaws when the cover is seated on said box, and means for connecting a fuse between at least two of said switch blades connecting the line and load circuits.

2. The switch according to claim 1, wherein said bay portions of said box extend above the adjacent end walls, whereby said cover rests on the upper edges of said side and end walls of said box and within said bay portions.

3. The switch according to claim 1, wherein said switch further comprises a first pair of jumpers for connecting electrically respective pairs of said switch jaws, a second pair of jumpers for connecting electrically respective pairs of said switch blades, 21 pair of fuse clips, one connected to each of the jumpers joining said switch blades, said fuse clips being located so that the fuse carried thereby occupies the bay and recessed portions of said box.

4. A puller type switch comprising a base assembly and a puller assembly; said base assembly comprising a molded hollow rectangular box being open at the top and having side walls, end walls and bottom, said bottom being provided with a recessed portion located intermediate the side walls, said end walls shaped to include a bay portion intermediate the side edges thereof and extending from top to bottom, the distance between said bay portions and the increased space provided by said recessed portion being sufiicient to accommodate a cartridge-type fuse of relatively large size and the lesser distance between the remaining portions of the end walls being suflicient to accommodate alternatively a pair of fuses of smaller size, a platform provided at each end of the box extending from the bottom thereof, a terminal post mounted on each of said platforms, a pair of switch jaws mounted on the bottom of the box at each of the end walls thereof, and means connecting said terminal posts to switch jaws of respective pairs; said puller assembly comprising a molded cover for covering the top of said box, the ends of said cover including bay portions similar in shape to, and dimensioned to fit snugly between, the bay portions in said box, means connecting two pairs of switch blades to the underside of said cover positioned to engage said switch jaws when the cover is seated on said box, and means for connecting a fuse between at least two of said switch blades.

5. The switch according to claim 4, wherein said bay portions of said box extend above the adjacent end walls, whereby said cover rests on the upper edges of said side and end walls of said box and within said bay portions.

6. The switch according to claim 4, wherein said switch further comprises a first pair of jumpers for connecting electrically respective pairs of said switch jaws, a second pair of jumpers for connecting electrically respective pairs of said switch blades, a pair of fuse clips, one connected to each of the jumpers joining said switch blades, said fuse clips being located so that the fuse carried thereby occupies the bay and recessed portions of said box.

References Cited in the file of this patent UNITED STATES PATENTS 728,195 Brady May 19, 1903 1,733,370 Frank Oct. 29, 1929 1,974,452 Frank Sept. 25, 1934 

